encoding/base64: add unpadded encodings (https://golang.org/cl/1511)
log: add SetOutput functions (https://golang.org/cl/2686, https://golang.org/cl/3023)
net/http: support for setting trailers from a server Handler (https://golang.org/cl/2157)
+net/http/cgi: fix REMOTE_ADDR, REMOTE_HOST, add REMOTE_PORT (https://golang.org/cl/4933)
net/smtp: add TLSConnectionState accessor (https://golang.org/cl/2151)
+os/signal: add Ignore and Reset (https://golang.org/cl/3580)
runtime, syscall: use SYSCALL instruction on FreeBSD (Go 1.5 now requires FreeBSD 8-STABLE+) (https://golang.org/cl/3020)
strings: add Compare(x, y string) int, for symmetry with bytes.Compare (https://golang.org/cl/2828)
testing/quick: support generation of arrays (https://golang.org/cl/3865)